Commit | Line | Data |
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cc7feb7f | 1 | // SPDX-License-Identifier: GPL-2.0-only |
dd4cae8b | 2 | /* |
021cbc1e | 3 | * Microchip AR1020 and AR1021 driver for I2C |
dd4cae8b CG |
4 | * |
5 | * Author: Christian Gmeiner <christian.gmeiner@gmail.com> | |
dd4cae8b CG |
6 | */ |
7 | ||
8a038b83 | 8 | #include <linux/bitops.h> |
dd4cae8b CG |
9 | #include <linux/module.h> |
10 | #include <linux/input.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/interrupt.h> | |
15 | ||
ee85fbe1 | 16 | #define AR1021_TOUCH_PKG_SIZE 5 |
dd4cae8b CG |
17 | |
18 | #define AR1021_MAX_X 4095 | |
19 | #define AR1021_MAX_Y 4095 | |
20 | ||
e55057e8 MK |
21 | #define AR1021_CMD 0x55 |
22 | ||
23 | #define AR1021_CMD_ENABLE_TOUCH 0x12 | |
24 | ||
dd4cae8b CG |
25 | struct ar1021_i2c { |
26 | struct i2c_client *client; | |
27 | struct input_dev *input; | |
ee85fbe1 | 28 | u8 data[AR1021_TOUCH_PKG_SIZE]; |
dd4cae8b CG |
29 | }; |
30 | ||
31 | static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id) | |
32 | { | |
33 | struct ar1021_i2c *ar1021 = dev_id; | |
34 | struct input_dev *input = ar1021->input; | |
35 | u8 *data = ar1021->data; | |
36 | unsigned int x, y, button; | |
37 | int retval; | |
38 | ||
39 | retval = i2c_master_recv(ar1021->client, | |
2274c987 | 40 | ar1021->data, sizeof(ar1021->data)); |
dd4cae8b CG |
41 | if (retval != sizeof(ar1021->data)) |
42 | goto out; | |
43 | ||
44 | /* sync bit set ? */ | |
8a038b83 | 45 | if (!(data[0] & BIT(7))) |
dd4cae8b CG |
46 | goto out; |
47 | ||
48 | button = data[0] & BIT(0); | |
49 | x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f); | |
50 | y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f); | |
51 | ||
52 | input_report_abs(input, ABS_X, x); | |
53 | input_report_abs(input, ABS_Y, y); | |
54 | input_report_key(input, BTN_TOUCH, button); | |
55 | input_sync(input); | |
56 | ||
57 | out: | |
58 | return IRQ_HANDLED; | |
59 | } | |
60 | ||
61 | static int ar1021_i2c_open(struct input_dev *dev) | |
62 | { | |
e55057e8 MK |
63 | static const u8 cmd_enable_touch[] = { |
64 | AR1021_CMD, | |
65 | 0x01, /* number of bytes after this */ | |
66 | AR1021_CMD_ENABLE_TOUCH | |
67 | }; | |
dd4cae8b CG |
68 | struct ar1021_i2c *ar1021 = input_get_drvdata(dev); |
69 | struct i2c_client *client = ar1021->client; | |
e55057e8 MK |
70 | int error; |
71 | ||
72 | error = i2c_master_send(ar1021->client, cmd_enable_touch, | |
73 | sizeof(cmd_enable_touch)); | |
74 | if (error < 0) | |
75 | return error; | |
dd4cae8b CG |
76 | |
77 | enable_irq(client->irq); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static void ar1021_i2c_close(struct input_dev *dev) | |
83 | { | |
84 | struct ar1021_i2c *ar1021 = input_get_drvdata(dev); | |
85 | struct i2c_client *client = ar1021->client; | |
86 | ||
87 | disable_irq(client->irq); | |
88 | } | |
89 | ||
92f63271 | 90 | static int ar1021_i2c_probe(struct i2c_client *client) |
dd4cae8b CG |
91 | { |
92 | struct ar1021_i2c *ar1021; | |
93 | struct input_dev *input; | |
94 | int error; | |
95 | ||
96 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
97 | dev_err(&client->dev, "i2c_check_functionality error\n"); | |
98 | return -ENXIO; | |
99 | } | |
100 | ||
101 | ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL); | |
102 | if (!ar1021) | |
103 | return -ENOMEM; | |
104 | ||
105 | input = devm_input_allocate_device(&client->dev); | |
106 | if (!input) | |
107 | return -ENOMEM; | |
108 | ||
109 | ar1021->client = client; | |
110 | ar1021->input = input; | |
111 | ||
112 | input->name = "ar1021 I2C Touchscreen"; | |
113 | input->id.bustype = BUS_I2C; | |
114 | input->dev.parent = &client->dev; | |
115 | input->open = ar1021_i2c_open; | |
116 | input->close = ar1021_i2c_close; | |
117 | ||
53f0b7f0 | 118 | __set_bit(INPUT_PROP_DIRECT, input->propbit); |
dd4cae8b CG |
119 | input_set_capability(input, EV_KEY, BTN_TOUCH); |
120 | input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0); | |
121 | input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0); | |
122 | ||
123 | input_set_drvdata(input, ar1021); | |
124 | ||
125 | error = devm_request_threaded_irq(&client->dev, client->irq, | |
126 | NULL, ar1021_i2c_irq, | |
bcd9730a | 127 | IRQF_ONESHOT | IRQF_NO_AUTOEN, |
dd4cae8b CG |
128 | "ar1021_i2c", ar1021); |
129 | if (error) { | |
130 | dev_err(&client->dev, | |
131 | "Failed to enable IRQ, error: %d\n", error); | |
132 | return error; | |
133 | } | |
134 | ||
dd4cae8b CG |
135 | error = input_register_device(ar1021->input); |
136 | if (error) { | |
137 | dev_err(&client->dev, | |
138 | "Failed to register input device, error: %d\n", error); | |
139 | return error; | |
140 | } | |
141 | ||
dd4cae8b CG |
142 | return 0; |
143 | } | |
144 | ||
eb6abb89 | 145 | static int ar1021_i2c_suspend(struct device *dev) |
dd4cae8b CG |
146 | { |
147 | struct i2c_client *client = to_i2c_client(dev); | |
148 | ||
149 | disable_irq(client->irq); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
eb6abb89 | 154 | static int ar1021_i2c_resume(struct device *dev) |
dd4cae8b CG |
155 | { |
156 | struct i2c_client *client = to_i2c_client(dev); | |
157 | ||
158 | enable_irq(client->irq); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
eb6abb89 JC |
163 | static DEFINE_SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, |
164 | ar1021_i2c_suspend, ar1021_i2c_resume); | |
dd4cae8b CG |
165 | |
166 | static const struct i2c_device_id ar1021_i2c_id[] = { | |
95123fc4 | 167 | { "ar1021", 0 }, |
dd4cae8b CG |
168 | { }, |
169 | }; | |
170 | MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id); | |
171 | ||
245165de | 172 | static const struct of_device_id ar1021_i2c_of_match[] = { |
dd4cae8b CG |
173 | { .compatible = "microchip,ar1021-i2c", }, |
174 | { } | |
175 | }; | |
176 | MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match); | |
177 | ||
178 | static struct i2c_driver ar1021_i2c_driver = { | |
179 | .driver = { | |
180 | .name = "ar1021_i2c", | |
eb6abb89 | 181 | .pm = pm_sleep_ptr(&ar1021_i2c_pm), |
dd4cae8b CG |
182 | .of_match_table = ar1021_i2c_of_match, |
183 | }, | |
184 | ||
d8bde56d | 185 | .probe = ar1021_i2c_probe, |
dd4cae8b CG |
186 | .id_table = ar1021_i2c_id, |
187 | }; | |
188 | module_i2c_driver(ar1021_i2c_driver); | |
189 | ||
190 | MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>"); | |
021cbc1e | 191 | MODULE_DESCRIPTION("Microchip AR1020 and AR1021 I2C Driver"); |
dd4cae8b | 192 | MODULE_LICENSE("GPL"); |